organization-defined security function

A parameter-bearing descriptor used in control statements to denote the subset of a system's policy-enforcing hardware, software, and firmware capabilities — formally called "security functions" — that a particular organization has selected, named, or scoped for a given control requirement. It is distinguished from the base term "security functions" by the "organization-defined" qualifier, which is a standard NIST SP 800-53 templating convention signaling that the implementing organization must enumerate the specific functions in its own security plan rather than accepting a universal list. In practice, such functions include account management interfaces, access-authorization configurations, audit-event settings, and intrusion-detection parameters, but the exact set is determined by each organization's system boundaries and risk decisions. The phrase is compositional: its meaning is fully derived from its two established components and it carries no additional sense beyond them.

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